1866465 has 48 divisors (see below), whose sum is σ = 3556800. Its totient is φ = 902016.

The previous prime is 1866461. The next prime is 1866467. The reversal of 1866465 is 5646681.

1866465 is a `hidden beast` number, since 1 + 8 + 6 + 646 + 5 = 666.

It is not a de Polignac number, because 1866465 - 2² = 1866461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31606 + ... + 31664.

It is an arithmetic number, because the mean of its divisors is an integer number (74100).

2^1866465 is an apocalyptic number.

1866465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1866465 is a deficient number, since it is larger than the sum of its proper divisors (1690335).

1866465 is a wasteful number, since it uses less digits than its factorization.

1866465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 123 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1866465 is about 1366.1862976915. The cubic root of 1866465 is about 123.1232158090.

The spelling of 1866465 in words is "one million, eight hundred sixty-six thousand, four hundred sixty-five".